Seaborgium,  ₁₀₆Sg

General properties
Pronunciation	/siːˈbɔːrɡiəm/ ( listen) ​(see-BOR-gee-əm)
Mass number	269 (most stable isotope)
Seaborgium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson W ↑ Sg ↓ (Uhn) dubnium ← seaborgium → bohrium
Atomic number (Z)	106
Group	group 6
Period	period 7
Block	d-block
Element category	transition metal
Electron configuration	[Rn] 5f14 6d4 7s2
Electrons per shell	2, 8, 18, 32, 32, 12, 2
Physical properties
Phase at STP	Sg: Unknown phase (predicted)
Density (near r.t.)	35.0 g/cm3 (predicted)
Atomic properties
Oxidation states	0, (+3), (+4), (+5), +6 (parenthesized: prediction)
Ionization energies	1st: 757 kJ/mol 2nd: 1733 kJ/mol 3rd: 2484 kJ/mol (more) (all but first estimated)
Atomic radius	empirical: 132 pm (predicted)
Covalent radius	143 pm (estimated)
Other properties
Natural occurrence	Sg: Synthetic
Crystal structure	​body-centered cubic (bcc) (predicted)
CAS Number	54038-81-2
History
Naming	after Glenn T. Seaborg
Discovery	Lawrence Berkeley National Laboratory (1974)
Main isotopes of seaborgium
Iso­tope Abun­dance Half-life (1/2) Decay mode Pro­duct 265Sg syn 8.9 s α 261Rf 265mSg syn 16.2 s α 261mRf 267Sg syn 1.4 min 17% α 263Rf 83% SF 269Sg syn 14 min α 265Rf 271Sg syn 1.6 min 67% α 267Rf 33% SF
view talk edit | references

Seaborgium is a chemical element. In the past, it has been named eka-tungsten but is now named seaborgium. It has the symbol Sg and it has the atomic number 106. Seaborgium is a radioactive element that does not exist in nature. It has to be made. The most stable isotope is ²⁷¹Sg. Seaborgium-271 has a half-life of 2.4 minutes.